text stringlengths 1 1.11k | source dict |
|---|---|
quantum-mechanics, operators, hilbert-space, schroedinger-equation, time-evolution
Title: Time Evolution of Eigenkets in the Heisenberg picture I'm reading Modern Quantum Mechanics by Jun John Sakurai and in section 2.2 he talks about Base Kets and Transition Amplitudes. He goes to show, that $|a',t\rangle=\mathcal{U}... | {
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"tags": "quantum-mechanics, operators, hilbert-space, schroedinger-equation, time-evolution... |
ros2
bus info: pci@0000:00:02.0
version: 05
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm bus_master cap_list
configuration: driver=i915 latency=0
resources: irq:150 memory:c4000000-c4ffffff memory:a0000000-afffffff ioport:7000(size=64) | {
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algorithms, counting
This code works fine , but the problem is when i input large numbers like
number1=100
number2=500
final_number=50000000
in this case , the computer takes very long time to count/find/print all possible ways. Is there any way to make alghoritm for this as fast for big numbers too?
I have found ou... | {
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"tags": "algorithms, counting",
"url": null
} |
quantum-field-theory, supersymmetry, quantum-chromodynamics
Mesons operators : $M^j_i = \bar \Phi^{jc}\Phi_{ci}$
Baryons operators : $B_{i_1...i_n} = \epsilon^{c_1c_2...c_{N_c}}\Phi_{c_1i_1}\Phi_{c_2i_2}...\Phi_{c_{N_c}i_{N_c}}$
$\quad \quad \quad \quad \quad \quad \quad \bar B^{i_1...i_n} = \epsilon_{c_1c_2...c_{N_c... | {
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"tags": "quantum-field-theory, supersymmetry, quantum-chromodynamics",
"url": null
} |
quantum-field-theory, mass, standard-model, dark-matter, inertia
Title: Does Dark Matter interact with Higgs Field? Dark matter does have gravitational mass as we know from its discovery. Does it have inertial mass? The answer depends on the identity of the dark matter.
In the most widely believed scenario, dark matte... | {
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"tags": "quantum-field-theory, mass, standard-model, dark-matter, inertia",
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python, featurecounts
The github link to the python toolkit: iFeature A few additional hints that may help clarify the algorithm:
The 20 magic number is because there are twenty amino acids. The 400 magic number is because there are 20 * 20 potential dipeptides.
These peptides are then hashed by converting their lett... | {
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"tags": "python, featurecounts",
"url": null
} |
c#, object-oriented, .net, stackexchange, polymorphism
public string FormattedEndpoint
{
get
{
var values = new Dictionary<string, string>();
values.Add(nameof(PageSize).ToLower(), PageSize.ToString());
values.Add(nameof(Page).ToLower(), Page.ToString());
... | {
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"tags": "c#, object-oriented, .net, stackexchange, polymorphism",
"url": null
} |
homework-and-exercises, electric-circuits
Title: Calculating current in parallel Hypothetically, I have a circuit with a two $10\Omega$ resistors in parallel. I supply them say, $2V$. How do I calculate the current?
What if, say, the circuit now has a $10\Omega$ resistor and a $5\Omega$ resistor in parallel with $2V$... | {
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"tags": "homework-and-exercises, electric-circuits",
"url": null
} |
electrostatics, classical-electrodynamics, mass-energy
We build up the sphere by adding subsequent infinitesimal layers of charge (carried from infinite distance). From Gauss’s theorem we know that, for an uniformly charged sphere having charge density $\rho$, radius $r$, and total charge $q=q(r)=\rho(4\pi r^3/3)$, th... | {
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"openwebmath_score": null,
"tags": "electrostatics, classical-electrodynamics, mass-energy",
"url": null
} |
java, game, swing, gui
JButton addBlu = new JButton("+");
addBlu.setBackground(Color.BLUE);
addBlu.setPreferredSize(b);
addBlu.setFocusPainted(false);
addBlu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
increaseBlu();
... | {
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"tags": "java, game, swing, gui",
"url": null
} |
beginner, rust
// Like from, but uses the default RNG of its type.
impl<RNG: rand::RngCore + Default> RandBoolIter<RNG> {
fn new() -> RandBoolIter<RNG> {
Self::from(RNG::default())
}
}
// Also allow a default RandBoolIter.
impl<RNG: rand::RngCore + Default> Default for RandBoolIter<RNG> {
fn defau... | {
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"tags": "beginner, rust",
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} |
audio, classification, music
Title: Can software distinguish between different musical instruments If possible, I would like to write a little script that can identify different musical instruments from just a recording. Apart from variations of amplitude and frequency over time (which can be shown by time-dependant ... | {
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"id": 3009,
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"tags": "audio, classification, music",
"url": null
} |
java, beginner, object-oriented
getTop() >= otherRectangle.getTop()) {
return true;
} else return false;
}
public boolean intersects(Rectangle otherRectangle) {
Interval leftToRight = new Interval(getLeft(), getRight());
Interval bottomToTop = new Interval(getBottom(), getTo... | {
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"tags": "java, beginner, object-oriented",
"url": null
} |
the-sun, solar-system, gravity, orbital-mechanics
$$T^2 = 4 \pi^2 \frac{a^3}{GM}$$
$$T^2 = \frac{3 \pi}{G \rho} \left(\frac{a}{R}\right)^3$$
or
$$T = \sqrt{\frac{3 \pi}{G \rho}} \ \ \left(\frac{a}{R}\right)^{3/2}$$ | {
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quantum-mechanics, hilbert-space, operators, quantum-information, commutator
So, how do we say this in words? We say that $B$ is block diagonal because $B$ still can not connect the subspaces with different $a$ values.
As a concrete example, consider a 4x4 matrix $A$ in the basis where the $|a,m\rangle$ are eigenvecto... | {
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"tags": "quantum-mechanics, hilbert-space, operators, quantum-information, commutator",
"... |
Define and use Piecewise functions in context 2. consists of two real number lines that intersect at a right angle. is a function such that a. Find the ordered pairs for the funciton F G Let f(x) = x 2;g(x) = x2 + x, both with domain all real numbers. This is the contrapositive of the definition. The Quadratic Function... | {
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"lm_q2_score": 0.8670357512127872,
"openwebmath_perplexity": 429.69633344663407,
"openwebmath_score": 0.6847590804100037,
... |
c#, sql, .net, asp.net, .net-2.0
// Open the class
sw.WriteLine("public class DBT" + TableName + " : DatabaseAccess");
sw.WriteLine("{");
// Add accessors
foreach (TableFieldInfo f in fields)
{
if (getType(f.type) == "int")
sw.WriteLine("\tprivate " ... | {
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"tags": "c#, sql, .net, asp.net, .net-2.0",
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} |
forces, pressure, buoyancy, faq
Title: Balloons and lifting gases Hydrogen is the lightest element, so it's cable of lifting the most weight in out atmosphere (probably not the best terminology there, but you get the picture)
Would hot hydrogen (in the same sense as hot air) be able to lift even more mass?
Would a hig... | {
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• @GuyFsone: let me address your question one by one. Please be patient. (1)"I would like to know what is new here." As it was pointed out by a comment in meta, the logical structure of your original answer is heavily muddled. Since you have been keeping asking a hard evidence for what is wrong for your answer, let me ... | {
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"lm_q2_score": 0.8962513814471134,
"openwebmath_perplexity": 225.02490525720327,
"openwebmath_score": 0.8878737092018127,
"ta... |
the-moon, earth, angular-diameter
$$x^2+2\left(\frac{d_1d_2}{d_2-d_1}\right)x+y^2=0$$
$$\left(x+\frac{d_1d_2}{d_2-d_1}\right)^2+y^2=\left(\frac{d_1d_2}{d_2-d_1}\right)^2$$
Let
$$q=\frac{d_1d_2}{d_2-d_1}$$
Thus
$$(x+q)^2+y^2=q^2$$
which is a circle centred at $(-q, 0)$ with radius $q$.
Note that
$$\frac1q = \frac1{d_1}... | {
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Therefore $s =s_e-s_o =c s_o$.
Since $s_o$ diverges (as shown in zhoraster's deleted answer which just considers the primes), $s$ diverges.
• The idea of the proof is very similar to mine, but both $s_e$ and $s_o$ are diverging series, so we have to be careful in manipulating them, and $s_e=s_o(1+c)$ has little meani... | {
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"lm_q1q2_score": 0.8049525572073882,
"lm_q2_score": 0.8221891283434877,
"openwebmath_perplexity": 248.99624869582968,
"openwebmath_score": 0.9096659421920776,
"ta... |
java, beginner, strings
Hello World
I am a file
Read me until end-of-file.
Expected output
1 Hello World
2 I am a file
3 Read me until end-of-file.
However, whenever I uncomment out the
String input = in.nextLine();
My output only shows first 2 lines instead of all 3. I thought I need that line of code in order to... | {
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"tags": "java, beginner, strings",
"url": null
} |
electronic-configuration, hybridization
Now, how do you include hybrid orbitals? The problem arises because some hybrid orbitals already have superscript numbers (sp2, sp3 …) – how do you differentiate between these superscript numbers and those denoting how many electrons fill that orbital? If I were to write out the... | {
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"openwebmath_score": null,
"tags": "electronic-configuration, hybridization",
"url": null
} |
java, graph
private boolean hasCyclesInternal(Node<T> node) {
if (node.color == Color.WHITE) {
node.color = Color.GREY;
Set<Node<T>> adjNodes = vertexesWithAdjacents.get(node.key);
if (adjNodes != null) {
for (Node<T> adj : adjNodes) {
if ... | {
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"tags": "java, graph",
"url": null
} |
sets using proper notation. Worksheets attached for printing out of examples and questions. Draw each Venn diagram (and label!). Lesson 47 – Probabilities and Venn Diagrams 1. (5) A student from the course is chosen at random. Practice sorting the alphabet letters into consonants, vowels and both by using this Venn Dia... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9763105280113491,
"lm_q1q2_score": 0.8135835817159129,
"lm_q2_score": 0.8333246015211008,
"openwebmath_perplexity": 1173.8847628895987,
"openwebmath_score": 0.29417988657951355,
... |
discrete-signals, power-spectral-density, z-transform, magnitude
$$H(z)H\left(\frac{1}{z}\right)=(1+z^{-1})(1+z)=z+2+z^{-1}\tag{7}$$
The actual squared magnitude of $H(z)$ is
$$\big|H(z)\big|^2=|1+z^{-1}|^2=1+2\textrm{Re}\{z^{-1}\}+|z|^{-2}\tag{8}$$
On the unit circle $z=e^{j\omega}$ both $(7)$ and $(8)$ equal
$$\big|... | {
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"tags": "discrete-signals, power-spectral-density, z-transform, magnitude",
"url": null
} |
ros, gazebo, rviz, ros-melodic
<!-- body -->
<xacro:property name="chasis_length" value="1.0"/>
<xacro:property name="chasis_heigth" value="0.45"/>
<xacro:property name="chasis_width" value="0.5"/>
<link name="chasis">
<inertial>
<origin xyz="0.0 0.0 0.0" rpy="0.0 0.0 0.0"/>
<mass value="1.0"/... | {
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"id": 35867,
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"tags": "ros, gazebo, rviz, ros-melodic",
"url": null
} |
data: save/load. 1. Signal Processing. Gaujal2, L. -- >a=[1 2 3; 4 5 6; 7 8 9];. MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages. Creating and modifying There are several ways of creat... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9433475683211323,
"lm_q1q2_score": 0.8073651018048328,
"lm_q2_score": 0.8558511506439707,
"openwebmath_perplexity": 3828.1249397353417,
"openwebmath_score": 0.40898624062538147,
"t... |
audio-processing, array-signal-processing
Title: Number of microphone limitation for Spherical Harmonics based DOA estimation I am following this book "Theory and Applications of Spherical Microphone Array Processing", as well as this paper on DOA estimation "Eigenbeam-ESPRIT for DOA-Vector Estimation".
My dataset is... | {
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"tags": "audio-processing, array-signal-processing",
"url": null
} |
c++, object-oriented, c++14, overloading
/** Class which has been asked in the question. In short Iteam class will act like
a struct for iteamList class, since I have declared iteamList class as a friend
of Iteam class **/
class iteamList; // forward delaration of iteamList class
class Iteam
{
private:
int... | {
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"tags": "c++, object-oriented, c++14, overloading",
"url": null
} |
mechanical-engineering
(The question has an intermediate value Q = A y, but I'm going to ignore that - you can substitute it back in if you like, having calculated A and y, at any point in this discussion.)
The value of A is the area of a 'chunk' of the section. The value of y is the distance from the neutral axis of... | {
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"tags": "mechanical-engineering",
"url": null
} |
time-series, scipy
A peak is identified at 1000
The next valley that can be identified must be >1050 or < 950.
It is ok for two valleys (or peaks) to be identified in succession (same as with argrelextrema). You can see examples in the attached chart.
TY for any pointers/guidance in advance. LMK if/where I can add mo... | {
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"tags": "time-series, scipy",
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} |
ros2
ament_cmake_export_interfaces
: required=0.9.7, local=0.9.6
ament_cmake_export_link_flags
: required=0.9.7, local=0.9.6
ament_cmake_gmock
: required=0.9.7, local=0.9.6
rqt_shell
: required=1.0.0, local=1.0.0
diagnostic_updater
: required=2.0.4, local=2.0.4
examples_rclcpp_minimal_timer
: required=0.9.3, local=0.9... | {
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"tags": "ros2",
"url": null
} |
javascript, beginner, react.js, jsx
return
}
// see above, rather use else IMO
this.setState(state)
// use break instead
return
case 'remove':
var newState = this.state | {
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• There are functions PartitionsP and PartitionsQ that do this, but without the $k$ restriction so this only gives an upper bound. Oct 18 '20 at 14:47
• I do not follow that "or equivalently..." part. Oct 18 '20 at 14:55
• Anyway, it seems like it should just be Binomial[n+k,k] unless I am missing something big (like, ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9706877717925422,
"lm_q1q2_score": 0.8231119283375145,
"lm_q2_score": 0.8479677526147223,
"openwebmath_perplexity": 792.29867536434,
"openwebmath_score": 0.4150492548942566,
"tags"... |
javascript, node.js, server, express.js, neo4j
relationshipType = result[0].get("relationship") + "";
} else {
relationshipType = "";
}
cb(null, "");
},
function(err) {
callback(err);... | {
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"openwebmath_score": null,
"tags": "javascript, node.js, server, express.js, neo4j",
"url": null
} |
c++, file, c++17
auto longest = word_query::longest_word(words);
if (longest) {
std::cout << "The longest word in " << filename
<< " is: " << *longest << '\n';
}
auto shortest = word_query::shortest_word(words);
if (shortest) {
std::cout << "The shortest word in " << filena... | {
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"tags": "c++, file, c++17",
"url": null
} |
THanks
2. Jan 6, 2016
### Khashishi
Most functions you deal with at your level will be analytic functions. https://en.wikipedia.org/wiki/Analytic_function
Analytic functions are continuous and give the same value for the limit no matter what direction you approach the limit from. Moreover, the derivatives exist and ... | {
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As it is a definition, the validity of the property (here "being a basis for the topology") must be defined by it in all cases. So implicitly all cases not mentioned do not have the property.
This convention is even stronger than the "if" meaning "iff" in definitions. Take as example the definition "an integer $p>1$ i... | {
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"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 502.5995474959068,
"openwebmath_score": 0.8058006763458252,
"tag... |
Consider $\begin{vmatrix}&space;2&space;&&space;3\\&space;3&space;&&space;6&space;\end{vmatrix}=12-9=3\neq&space;0$
There is a minor of order 2 of A which does not vanish
$\rho&space;(A)=2$
#### 2. Normal form of a matrix
$\begin{bmatrix}&space;I_{r}&space;&O&space;\\&space;O&space;&&space;O&space;\end{bmatrix},\:... | {
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"lm_q1_score": 0.9907319863454372,
"lm_q1q2_score": 0.8099971803809437,
"lm_q2_score": 0.8175744717487329,
"openwebmath_perplexity": 685.8729709791961,
"openwebmath_score": 0.8245596289634705,
"tags": n... |
python, python-3.x, random
Title: Generating random email addresses The code below generates only 10 email domains. To me, this is bruteforce programming. Is there another random integer library? Could I use something like random.seed() in C++?
What is a more elegant way to generate 100 emails names using some Python ... | {
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"tags": "python, python-3.x, random",
"url": null
} |
java, strings
&& c < mostRepeated) {
maxCount = occurrences.get(c);
mostRepeated = c;
}
}
return maxCount == 0
? Collections.emptyMap()
: Map.of(mostRepeated, occurrences.get(mostRepeated));
} | {
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"openwebmath_score": null,
"tags": "java, strings",
"url": null
} |
gravity, angular-momentum, astrophysics, galaxies, star-clusters
Is there some physics or math theory explains why the Galaxy turns out to be planar-like (or spiral-like) instead of spherical-like?
See also a somehow related question in a smaller scale: Can I produce a true 3D orbit?
p.s. Other than the classical stab... | {
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"tags": "gravity, angular-momentum, astrophysics, galaxies, star-clusters",
"url": null
} |
organic-chemistry, reaction-mechanism, halides
(2) If the reaction occurs via the $\mathrm{S_N1}$ mechanism (note that which mechanism is preferred depends on the structure of the haloalkane, and in some cases a haloalkane can react via both mechanisms), you have a two-step process in which the haloalkane initially di... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, reaction-mechanism, halides",
"url": null
} |
condensed-matter
You can observe the counter propagation of the spin up (say red) and spin down (blue) along the top and bottom edges. The quantity $T_{ij}$ represents the transmission probability for the electron to go from contact $i \rightarrow j$. As you can observe from the figure only $T_{i,i+1}$ and $T_{i+1,i}$... | {
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"openwebmath_score": null,
"tags": "condensed-matter",
"url": null
} |
for Scheduling. But this family of algorithms is fundamental for the functioning of the World. A Venn diagram with PDF blending The algorithms library defines functions for a variety of purposes (e. There are three templates available. , sin(\x r). Selected LaTeX commands for math symbols and special typographic charac... | {
"domain": "com.ph",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9658995752693051,
"lm_q1q2_score": 0.8303488532283497,
"lm_q2_score": 0.8596637523076225,
"openwebmath_perplexity": 1303.5526224385758,
"openwebmath_score": 0.8193498849868774,
"tags": nu... |
Therefore, the proportion of members who are American men, Russian men, or Russian women is:
$\frac{3}{5} + \frac{1}{4} = \frac{12}{20} + \frac{5}{20} = \frac{17}{20}$
Therefore, the proportion of members who are American women is:
$1 - \frac{17}{20} = \frac{3}{20} = \text{A}$. | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9891815497525024,
"lm_q1q2_score": 0.8679838596061126,
"lm_q2_score": 0.8774767986961403,
"openwebmath_perplexity": 459.02175419851187,
"openwebmath_score": 0.5978457927703857,
"ta... |
forces, pressure, free-body-diagram, fluid-statics, density
it hasn't displaced any fluid. As you lower the object into a fluid, the force of gravity pulling it down is constant but the buoyant force on the object increases as it displaces more fluid. At some point, a floating object will displace enough fluid for the... | {
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"tags": "forces, pressure, free-body-diagram, fluid-statics, density",
"url": null
} |
Veritas Prep Reviews
Kudos [?]: 17381 [2], given: 232
Intern
Joined: 14 Nov 2011
Posts: 12
Kudos [?]: 2 [2], given: 1
Re: How many prime numbers between 1 and 100 are factors of 7150 [#permalink]
### Show Tags
13 Feb 2012, 19:09
2
KUDOS
I also got 2,5,7,11 and 13 but it took me more than the two minutes to break ... | {
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"lm_q2_score": 0.8633916205190225,
"openwebmath_perplexity": 2367.1665550121934,
"openwebmath_score": 0.5249361395835876,
"tag... |
newtonian-mechanics, forces, earth, air, centrifugal-force
Title: Does the earth exert centrifugal force on us in air? Whether the centrifugal force exerted by earth due to rotation be felt or even applied to us if we were in air ? The landmass rotates with earth so it is exerted on us radially outwards , but that isn... | {
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"tags": "newtonian-mechanics, forces, earth, air, centrifugal-force",
"url": null
} |
c#, beginner, mvc, controller
db.tb_CheckoutCheckin.Add(checkoutRecord);
db.tb_CheckoutCheckin.Add(checkoutRecord1);
db.SaveChanges();
ModelState.Clear();
var model = db.tb_CheckoutCheckin.Where(s => s.CheckinDate == null);
ViewBag.Message... | {
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"openwebmath_score": null,
"tags": "c#, beginner, mvc, controller",
"url": null
} |
complexity-theory, reductions, proof-techniques, np-hard
My guess is that the proof still correct, right? No, you may not modify $I_1$. By the time you get to Step 3, everything is determined and you might not change your instances. Say $f$ is the polytime transformation from Step 2. Then you need to show
$I_1$ is a y... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, reductions, proof-techniques, np-hard",
"url": null
} |
the-sun, orbital-mechanics, mathematics, solstice
Title: Confusion when calculating the length of the day I'm trying to solve this task:
Tula and Moscow are located on the same meridian. In which city length of the day is bigger on 22 of June? 22 of December? | {
"domain": "astronomy.stackexchange",
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"openwebmath_score": null,
"tags": "the-sun, orbital-mechanics, mathematics, solstice",
"url": null
} |
general-relativity, differential-geometry, differentiation, vector-fields, lie-algebra
The statement "noting that any vector $\mathbf{u}$ can be regarded as the tangent vector to a freely falling world line", seems problematic. Can't $\mathbf{u}$ be spacelike? In particular, in part E.2. we find $\mathbf{n}$ is used... | {
"domain": "physics.stackexchange",
"id": 86354,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "general-relativity, differential-geometry, differentiation, vector-fields, lie-alg... |
soft-question, resource-recommendations, education, big-list
General Qualifying exam books:
The following books are a part of a series dedicated to the qualifying exams in American Universities and has a large compilation of problems of all levels. Others in the series include Mechanics, Electromagnetism, Quantum Mech... | {
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"tags": "soft-question, resource-recommendations, education, big-list",
"url": null
} |
If $a$ and $b$ are numbers, then $a - b = a$ is only possible if $b = 0$.
If $A$ and $B$ are sets, then $A - B = A$ if $B = \emptyset$, but that is not the end of the story. We know that $A - B \subseteq A$, and after some thought we come up with
Definition: An element $\hat a \in A$ is said to be safe from $B$ if $\... | {
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"openwebmath_score": 0.9420474767684937,
"tag... |
everyday-chemistry, food-chemistry
That would be another strategy to confirm peak identity.
On the molecular biology side of things I'm sure there are techniques using PCR etc. that could amplify and characterize traces of DNA segments that came via ingredients of plant origin. e.g. One might be able to say a certain... | {
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"tags": "everyday-chemistry, food-chemistry",
"url": null
} |
inorganic-chemistry, acid-base, aqueous-solution, solubility
Title: What is ionic reaction equation for reaction between carbon dioxide and limewater?
Write the ionic reaction equation for the reaction
\[\ce{Ca(OH)2(aq) + CO2(g) <=> CaCO3(s) + H2O(l)}.\]
I first wrote the complete ionic equation as such:
\[\ce{Ca^2+... | {
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"tags": "inorganic-chemistry, acid-base, aqueous-solution, solubility",
"url": null
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c++, circular-list
_write.store(buffer._write.load(std::memory_order_acquire));
_read.store(buffer._read.load(std::memory_order_acquire));
_count = buffer._count;
MASK = buffer._size-1;
}
DSG:: RingBuffer& DSG:: RingBuffer::operator=(RingBuffer& buffer){
Buffer::operator=(buffer);
_write.store(buff... | {
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"tags": "c++, circular-list",
"url": null
} |
c, networking, embedded
But these are not necessarily problems for your application. And if in
your application there really is nothing else to be done until bytes arrive
and if power consumption is not a problem, then a busy loop is by far the
simplest solution.
Using interrupts will inevitably complicate the rest o... | {
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"tags": "c, networking, embedded",
"url": null
} |
conventions, tensor-calculus, differentiation, vector-fields, covariance
Let's move onto the divergence. It seems easier since it's a scalar, there's no basis vector to mess around with. Well, actually there are still some problem attached to that. Your formula is right, again, except that when you write the invariant... | {
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"url"... |
computational-chemistry, symmetry
Regarding your bonus question, why would there be? What would you do with it? Molecular structures are intrinsically 3D, so I don't see what you would do in a 2D (periodic or not) space? Even when we talk about planar or pseudo-2D structures (buckyball, nanotube, etc.) they are 3D obj... | {
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"openwebmath_score": null,
"tags": "computational-chemistry, symmetry",
"url": null
} |
navigation, namespace, base-footprint, amcl, move-base
I have inspected all the files but still could find an error.
Originally posted by David_Zizu on ROS Answers with karma: 46 on 2016-07-19
Post score: 1
Original comments
Comment by raultron on 2016-07-27:
+1
I am having the same problem trying to configure two r... | {
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"tags": "navigation, namespace, base-footprint, amcl, move-base",
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quantum-mechanics, hilbert-space, operators, eigenvalue, discrete
Now we can generalise this procedure in the case of $V\neq 0$. So we have to study the above said equation $$H\phi= E\phi\qquad E>0$$ or, equivalently $$(-\nabla^2-k^2)\phi = -U\phi\qquad U = \frac{2mV}{\hbar^2}\tag{3}$$ To solve $(3)$ we look for a sol... | {
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"tags": "quantum-mechanics, hilbert-space, operators, eigenvalue, discrete",
"url": null
... |
ros, catkin-make, catkin, catkin-ws, catkin-workspace
File "/usr/lib/python2.7/dist-packages/catkin_pkg/packages.py", line 87, in find_packages
packages = find_packages_allowing_duplicates(basepath, exclude_paths=exclude_paths,
exclude_subspaces=exclude_subspaces, warnings=warnings)
File "/usr/lib/python2.7/dis... | {
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"openwebmath_score": null,
"tags": "ros, catkin-make, catkin, catkin-ws, catkin-workspace",
"url": null
} |
algorithms, data-structures, time-complexity
Title: Find all values repeating more than $\lfloor n/k \rfloor$ times in $O(n \log k)$ time Given a parameter $k$ and an array (not sorted) of length $n$ return all values which repeat more than $\lfloor n/k \rfloor$ times in $O(n \log k)$ time.
I've managed this in $O(nk)... | {
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"tags": "algorithms, data-structures, time-complexity",
"url": null
} |
# KolmogorovSmirnovTest[] On Frequency Data
I have two observed frequency data, let say
f1 = {100, 200, 150, 100, 50};
f2 = {110, 195, 160, 105, 40};
and i want to know whether these random samples belong to the same distribution using KolmogorovSmirnovTest[]. Since KolmogorovSmirnovTest[] takes raw data, i simulat... | {
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"openwebmath_score": 0.3155681788921356,
"ta... |
gazebo, rviz, urdf, ubuntu, ros-groovy
Title: ROS Answers SE migration: urdf error
When I am trying to build my own robot according to this link:
http://www.ros.org/wiki/urdf/Tutorials/Create%20your%20own%20urdf%20file
It appears to me some errors:
seec@ubuntu:~$ rosmake urdfdom_model
[ rosmake ] rosmake starting... ... | {
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"tags": "gazebo, rviz, urdf, ubuntu, ros-groovy",
"url": null
} |
particle-physics, resource-recommendations, education
As for what the book isn't, it isn't a book on quantum field theory, and as such it can never be more than an introduction. At some point, if you really want to understand particle physics at a theoretical level, you'll have to learn some QFT. It also isn't a book ... | {
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15
The Idea of Convolution My favorite exposition of the topic is in one of Brad Osgood's lectures on the Fourier Transform. The discussion of convolution begins around 36:00, but the whole lecture has additional context that's worth watching. The basic idea is that, when you define something like the Fourier Transfor... | {
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"lm_q1q2_score": 0.8475412886269702,
"lm_q2_score": 0.8723473862936942,
"openwebmath_perplexity": 544.11270736401,
"openwebmath_score": 0.7695232033729553,
"tags"... |
javascript, object-oriented, html, dom
I would consider extending the options to include an id or selector of a parent (an anchor) where to add the grid (if null then use document.body as you do now).You could also add to the options the ID of the grid being created, then you would be potentially be able to handle mul... | {
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"openwebmath_score": null,
"tags": "javascript, object-oriented, html, dom",
"url": null
} |
data-mining, dataset
Title: NASDAQ Trade Data I am trying to find stock data to practice with, is there a good resource for this? I found this but it only has the current year.
I already have a way of parsing the protocol, but would like to have some more data to compare with. It doesn't have to be in the same format,... | {
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"tags": "data-mining, dataset",
"url": null
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ros, roscpp, spin
Originally posted by dcconner on ROS Answers with karma: 476 on 2013-02-25
Post score: 0
There is no safe option to achieve what you want. Given that a node can be configured with multi-threaded spinner, when you handle the callback of C, there is no guarantee all the callbacks have not been treated... | {
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"tags": "ros, roscpp, spin",
"url": null
} |
soft-question, mathematics
There are two kinds of ways of looking at mathematics, which for the purposes of this lecture, I will call the the Babylonian tradition and the Greek tradition. In Babylonian schools in mathematics, the student would learn something by doing a large number of examples until he caught on to t... | {
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"openwebmath_score": null,
"tags": "soft-question, mathematics",
"url": null
} |
c#
// in constructor:
actions = new Tuple<bool, Func<bool>>[]
{
new Tuple<bool, Func<bool>>(settings.StopOnBackupCurrentInstallerFailure, DoBackupCurrentVersion),
new Tuple<bool, Func<bool>>(settings.StopOnUpdateCodeBaseFailure, DoGetLatestVersion),
new Tuple<bool, Func<bool>>(settings.StopOnCompileFailure... | {
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"openwebmath_score": null,
"tags": "c#",
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} |
robotic-arm, ros-fuerte, debian
Originally posted by tfoote with karma: 58457 on 2012-06-05
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by derekjchow on 2012-06-06:
Thanks for the response. Catkin looks promising. Just out of curiosity, will the Catkin system simplify cross c... | {
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"tags": "robotic-arm, ros-fuerte, debian",
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} |
ros, kinect, turtlebot, gmapping-demo, icreate
[ WARN] [1341768074.806385721]: Costmap2DROS transform timeout. Current time: 1341768074.8062, global_pose stamp: 1341768074.0065, tolerance: 0.5000
[ INFO] [1341768075.160692480]: MAP SIZE: 32, 32
[ INFO] [1341768075.181478240]: Subscribed to Topics: scan
[ INFO] [134176... | {
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} |
ros, tutorial, camera, viso2-ros, pointgrey
if (!valid )
{
// Settings are not valid
printf("Format7 settings are not valid\n");
return false;
}
// Set the settings to the camera
error = stereocameras[i]->SetFormat7Configuration(
&fr... | {
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"tags": "ros, tutorial, camera, viso2-ros, pointgrey",
"url": null
} |
error-correction, stabilizer-code, fault-tolerance
Is this always true? That is, if my $X$ and $Z$ stabilizer generators are identical, can $\otimes_{i=1}^n H_i$ always be identified with a product of logical Hadamards on all logical qubits followed by a permutation of the logical qubits? Or can it be a more general l... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "error-correction, stabilizer-code, fault-tolerance",
"url": null
} |
reference-request, soft-question, formal-methods, algebraic-topology
Of course both problems are undecidable (the second one being testing the simple connectedness) but it seems to me theoretically feasible.
Has this been done before? You find it is not feasible?
Resources I find interesting (feel free to add)
Progres... | {
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"tags": "reference-request, soft-question, formal-methods, algebraic-topology",
"url": nu... |
java, object-oriented, classes
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.*;
public class Bot extends PircBot {
public Timer timer;
private Logger log = Logger.getLogger(Bot.class);
private boole... | {
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"id": 9488,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented, classes",
"url": null
} |
orbit, orbital-elements
Title: Simulate an orbit with orbital elements I want to simulate the orbits of the planets from our solar system. I want to use orbital elements to calculate the current position(xyz) at a time t. The simulation doesn't have to be too exact, but the initial position of the bodies should be som... | {
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"id": 1236,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "orbit, orbital-elements",
"url": null
} |
c, wrapper, c++-cli
int Left;
Public fields are considered bad practice in .Net. Instead, you can use shorthand property syntax:
property int Left;
Frame() {
Top = 0;
Left = 0;
Bottom = 0;
Right = 0;
}
All fields of managed types are automatically initialized to the default value, so I think this is... | {
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"openwebmath_score": null,
"tags": "c, wrapper, c++-cli",
"url": null
} |
ofdm, analog
If the graph below is the LNA signal of 2 GHz LTE, what would the period of a cycle be in nanoseconds? There are about 20 cycles from what I understand. How many cycles of this type would a symbol take?
Later edit:
Regarding the third question, I've found an answer.
Digital processing of the signal is don... | {
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"tags": "ofdm, analog",
"url": null
} |
food, nutrition, energy-metabolism
Imagine pills that a person can take that covers all their base nutritional needs and that after taking this pill the person can eat whatever they want to meet their caloric requirements. Hypothetically, this pill could have some amount (how much?) fat, carbohydrates, protein, fiber,... | {
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"openwebmath_score": null,
"tags": "food, nutrition, energy-metabolism",
"url": null
} |
c#, object-oriented, multithreading, static
//
// inne wersje metody Log()
//
// 1. zeby zalogowac do innego pliku pojedynczy log
// 2. zeby zalogowac do konkretnego targeta innego niz zdefiniowane w klasie
//
// prostsze wersje funkcji do logowania
//
public static void Error(strin... | {
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"tags": "c#, object-oriented, multithreading, static",
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} |
c#, design-patterns, rubberduck, mocks
Mock<VBE> mock = new MockVbeBuilder()
.ProjectBuilder("TestProject1", vbext_ProjectProtection.vbext_pp_none)
.AddComponent("TestModule1", vbext_ComponentType.vbext_ct_StdModule, contentForProject1Module1)
.AddComponent("TestModule2", vbext_ComponentType.vbext_ct_StdMo... | {
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"tags": "c#, design-patterns, rubberduck, mocks",
"url": null
} |
$$\|\mathcal{T}\|_{\text{op}} = \underset{\|f\|=1}{\sup}\frac{\|\mathcal{T}f\|}{\|f\|}\leq \underset{\|f\|=1}{\sup}\frac{\|f\|}{\|f\|}=1$$
I tried seeing if I could then construct a function where the operator equals $$1$$, but I've had no success. Anybody have any solutions or hints? Any help is appreciated.
• Sorry... | {
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"lm_q2_score": 0.828938806208442,
"openwebmath_perplexity": 152.92956082027524,
"openwebmath_score": 0.9300310015678406,
"tags... |
data-formats, bufr
Title: Conversion of BUFR format into grib I am looking for Upper Air Observations (UAO) for Bay of Bengal region. I found NCEP ADP UAO dataset available in BUFR format. I am supposed to use UAO data in grib format only for the purpose of data assimilaion.
Is there any way, one can convert BUFR data... | {
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"tags": "data-formats, bufr",
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} |
java, performance
Title: Text box intuitive user-interaction using focus listeners This code aims to replace labels used to explain a text box's container. This is done by adding a default string when the text box is considered empty to explain the purpose of the text box. However, when the text box is not considered ... | {
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"tags": "java, performance",
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} |
python, formatting
print_table(the_list) The way that you find rows and columns is good. You can't iterate through the lists so this approach is good.
However using them for your comprehensions is bad.
The name a_list is not descriptive, and quite poor.
table whilst generic is much better.
Your comprehensions and loop... | {
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"openwebmath_score": null,
"tags": "python, formatting",
"url": null
} |
complexity-theory, asymptotics, runtime-analysis, average-case
Last we consider 4s where maximum is $d$. Hope it's easy to understand, that here we have $4$ parts with equal proportion $\frac{1}{4}\cdot \frac{1}{2}\cdot \frac{1}{2}$: 1) $b \gt a, c \gt b$ which gives $T=4$, 2) $b \gt a, c \lt b$ and $b \lt a, c \gt a$... | {
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"tags": "complexity-theory, asymptotics, runtime-analysis, average-case",
"url": null
} |
homework-and-exercises, ideal-gas, kinetic-theory
In your denominators, you used a value for the mass of the nuclei that is based on the ratio of the type $32$ divided by Avogadro's constant (number of particles per mole). However, in this way, you obtain the value that assumes the natural conversion factor $1\,{\rm g... | {
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"tags": "homework-and-exercises, ideal-gas, kinetic-theory",
"url": null
} |
python, serialization, base64
encoded_string += '0' * (num_bytes_len - 1) + '1'
encoded_string += num_bytes_bin
#Convert input to bytes
if item_type in (int, str):
if item_type == int:
encoded_string += '0' if x > 0 else '1'
remaining_bits = item_len %... | {
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"openwebmath_score": null,
"tags": "python, serialization, base64",
"url": null
} |
evolution, bioinformatics, protein-evolution
[edited to be more complete and direct]
1) Nei's distance is mostly for comparing populations of the same species, so it should be fine if that is what you are doing. I am guessing that based on your post, you are more interested in cross-species comparisons. Of course, the... | {
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"tags": "evolution, bioinformatics, protein-evolution",
"url": null
} |
python, python-3.x, hangman
that conveys the idea of counting: for example, wrong_guesses or n_wrong
are better than the singular wrong_guess. Similarly, a list of hangman
ascii-images should be HANGMEN, not HANGMAN.
Avoid names based on ambiguous pronouns. Names like your_word or my_foo
are often a bad idea. When wri... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, hangman",
"url": null
} |
algorithms, minimum-cuts
For example for this case:
The minimum number of cuts would be 7, and they are represented in the following picture.
Any idea to achieve this? (The rectangles are not always touching the borders.) Each edge of an inner rectangle that (that isn't on the exterior of the big rectangle) is a lin... | {
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"tags": "algorithms, minimum-cuts",
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} |
us <- as.matrix(m.svd$u[, 1:2]) vs <- as.matrix(m.svd$v[, 1:2])
m.approx1 <- us %*% ds %*% t(vs)
m.approx1
## [,1] [,2] [,3] [,4]
## [1,] 4.415069 14.211315 13.707656 9.726325
## [2,] 11.368776 3.139051 1.150429 3.177126
## [3,] 6.563779 13.034360 12.118249 9.169675
## [4,] 15.393557 7.4845... | {
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"lm_q2_score": 0.8221891327004132,
"openwebmath_perplexity": 8614.690130796489,
"openwebmath_score": 0.6164302229881287,
"tags": null,
... |
quantum-mechanics, quantum-interpretations, decoherence
When I first was introduced to QT we were taught around the formalism of the Copenhagen interpretation (vague and unsatisfactory concepts of observations/measurements with a totally arbitrary line-in-the-sand between quantum and classical) and it was my understan... | {
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"tags": "quantum-mechanics, quantum-interpretations, decoherence",
"url": null
} |
lagrangian-formalism, field-theory, variational-principle, action, locality
Title: QFTs without Lagrangian I have been reading other questions in this site, but I have not found answers to all my questions about theories without Lagrangians.
What do we mean exactly when we say that they do not have a Lagrangian? Do th... | {
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"tags": "lagrangian-formalism, field-theory, variational-principle, action, locality",
"u... |
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